Gantry Cranes offer an economical solution to bridge cranes when the building is inadequate to support a bridge crane or the crane system is to be located outdoors&period; A box girder gantry crane is a gantry crane that utilizes a "box" configuration in fabricating the girder&period; This box girder design incorporates a four-sided box with a running surface plate for the hoist trolley attached to the bottom of the box&period; The advantage of the box girder is that it possesses greater loading capabilities and is able to span greater bridge distances&period; The crane is generally utilized in pairs with the hoisting mechanism operating on rails attached to the top of each box girder&period;

Shipyard goliath crane is used for building vessels for shipyard company&period; As one type of gantry cranes&comma; it has wide range of usage&period;The capacity&comma; span&comma; height&comma; traveling and hoisting speed&comma; working classification and usage etc&period; Basic particulars should be offered&period;

1&period; Main girder&colon;Is welded of steel plates&comma; connected by high-strength precision bolt&period; There are sliding rail for trolley to travel upper the girder which is fixed on outrigger by high-tension precision bolt2&period; OutriggerA&rpar;&period; Consist of rigid outrigger and flexible outrigger&comma; all connection points are connected by high-tension boltB&rpar;&period; The ladder is used by operator to enter into cab or arriving at winchC&rpar;&period; When the span>30m&comma; there need a flexible leg aiming at reducing the lateral thrust the trolley has to the rail when the girder load objects&period;3&period; Travelling mechanism

Consist of driving gear box and passive wheel box&period;A&rpar;&period; The driving gear box supplies power to realize the crane's travelling&period;B&rpar;&period; What the difference between driving gear box and passive wheel box is that passive wheel box lacks transmission structure such as dynamo&comma; reducer and a pair of exposed gear4&period; Trolley with hoistIs made up of trolley frame&comma; winch and pulley blockA&rpar;&period; Trolley frame welded of steel plate is the loading and travelling mechanism of trolley with hoistingB&rpar;&period; Winch is the lifting mechanism of trolley&period; When it works&comma; wire rope affects the pulley as rising and falling movement&comma; which makes suspended objects lifting and loweringWarning&colon; Wire ropes need to be examined regularly and changed in time if there is a 10&percnt; broken wires&comma; loosen wires and wearing down&period;

5&period; CabA&rpar;&period; Glass window through which one can watch overall working condition is installed in the front and two sides of the cabB&rpar;&period; Electric cabinet as a group of independent cabinet&comma; fixed outside of cab is connected by control cable and linkage station which is set up in the cab6&period; Electrical systemA&rpar;&period; Lifting motor&comma; crane travelling motor and hydraulic power motor are included&period; The whole electrical system is controlled by PLC&period;B&rpar;&period; Two ways to operate the crane&colon; Cab operating and remote controlling&period;C&rpar;&period; Electric components are imported from Schneider in Germany7&period; PlatformPlatform is installed in order to maintain the crane&comma; the protective guard is added to protect the safety of servicemen&period;